The principal that states that younger rocks lie above other rocks in the superposition principal.
Answer:
In a situation in which You land your inflatable boat on a sandbar at high tide in Southeast Alaska, which has a large semi-diurnal tide. You intend to be away from the boat for 12 hours but come back early after only 8 hours. Your boat is, unfortunately, 400m from shore.
You will have to wait B) 4 hours and 25 minutes
to be able to use your boat
Explanation:
The reason behind this is that the water movement makes objects floating in its surface move at a certain rhythm. Generally, this measure is variable but after having the data of 400 m movement in 8 hours. We just have to divide to find out the speed at which the water moves the objects on its surface. We divide 400 between the 8 hours to obtain. 50 meters of distance advance in a single hour. Therefore in 4 hours and 25 minutes, it will be at the correct distance to be reached out and used.
B since there is a high chance of birth and a low chance of death
As of 2014 there are only 33 mega cities in existence.
Echo sounding
Explanation:
Harry Hess discovered the Mid-Atlantic spreading ridge by using echo sounding techniques.
- Hess was a professor of Geology at Princeton University.
- After the second world war, series of equipment used were deployed for scientific use.
- The echo sounding was one of such devices that was adopted in mapping the sea floor.
- It works by sending an echo to the ocean floor and determining the height to the base by their reflection.
- From his works, he observed and noticed the mid-oceanic ridge.
- This led to the formulation of the theory of sea floor spreading.
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Sea floor spreading brainly.com/question/9912731
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